The potty might be cold, maybe he just needs to get used to the BBLP, maybe he just prefers "in arms", or maybe he doesn't need to go. You could try a cozy on the potty, having a few "special" potty toys that he can play with only when on the potty. When DS would refuse the potty, I would give him a magazine to rip up. For some reason, that is WAY fun for him. I also tried putting the potty on the edge of my bed. I would squat beside the bed while holding him that way we could see eye to eye. I would sing or make silly faces or whatever just to entertain him while he sat.